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Returns the correct link url for a given Tag ID.
<a href=\"<?php echo get_tag_link($tag_id); ?>\">tag name</a>
Output from this function is filtered by the 'tag_link' filter. The first argument ($taglink) is the url as the function would normally output it, the second is the ID passed into the function.
apply_filters('tag_link', $taglink, $tag_id);
get_tag_link() is located in